History

Later, after all of his minions are destroyed by the 7 Kamen Riders, the Great Leader goes to confron them himself he takes on the form of a rock giant impervious to the attacks of the Riders. However, the Seven Legendary Riders manage to get inside his body by combining their powers. There, they find a giant alien brain who reveals himself to have been behind all the previous organizations they had fought. The Great Boss then self destructs in an attempt to kill all seven Riders, but they all escape before they can be consumed by the explosion.

Trivia

The Great Boss of Delza Army is similar to Dr. Noroi in that the Brain controls the Great Delza General and Noroi controls King Dark.